Warp stop-motion for looms.



No. 643,299.3' Patented Feb. I3, |900. C. A. LITTLEFIELD.

wARP sToP MoTloN Foo Looms.

Application mea No.: 3. 1699.3

(No Model.)

IST @llllilll y xo o 3 Ninn rares PATENT muon,

CHARLES A. LITTLEFIELD, `OE LOWELL, MASSACHUSETTS, ASSIGNOR TO THE DRAPER COMPANY, OF PORTLAND, MAINE, AND HOPEDALE, MASSA- OHUSETTS.

WARP STOP-MOTION FOR LOOIVIS.

SPECIFICATION forming part of Letters Patent No. 643,299, dated February 13, 1900. Application led November 3, 1899. Serial No. 735,655. (No model T0 @ZZ whom t may concern:

Be it known that I, CHARLES A. LITTLE- FIELD, of Lowell, county of Middlesex and State of Massachusetts, have invented an Improvement in Warp Stop-Motions for Looms, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parte.

This invention has for its object the production of novel stop-motion mechanism adapted particularly for use in looms, although not l restricted thereto.

In carrying out my invention I employ a series of movable detectors which are normallymaintainedinoperative byintact warps, the detectors engaging the warps in a peculiar and novel manner. Leasing members are provided which divide the warps into groups which form the planes of the shed, and between the said members the warps of the two groups cross each other, and in accordance with my invention each detector engages two crossed warps at their crossing, being held inoperative thereby. Should either Warp of the pair fail, the detector controlled thereby7 will move into operative position and similar stopping means will be actuated by or through such abnormal positioning.

I have herein illustrated one embodiment of my invention as applied to a looln as the :most general application thereof, but my invention is not restricted to such use or application.

Figure l is a sectional view of a loom, taken from front to rear, with one embodiment of my invention applied thereto. Fig. 2 is a partial sectional view thereof on the line oc, Fig. 1, looking toward the left, the leasing members and warps being omitted; and Fig. 3 is an enlarged perspective detail showing clearly the manner in which a detector engages the pair of crossed warps.

The loom-frame A, breast-beam A40, the lay A3, and the lay-swords, one of which, as A4, is herein shown, the shipper S, and the loomharness H may be of any usual or well-known construction.

As shown in the drawings herein, a knockoff lever a is pivoted to the loom-frame to throw the shipper S lout of its usual holdingnotch when the loom is to be stopped, said knock-oif lever being pivotally connected at a with a knock-off rod c2, mounted to slide in suitable bearings oas on the loom side, the rear end of the rod being offset, as at c4.

, I have herein shown a bunter b as movable with the lay and for convenience pivotally connected at bx with one ot' the lay-swords, the normal reciprocation of the bunter being out of rangeof the bent end a4 of the knockoff rod. The bunter is herein shown as sustained and guided in its movements by a sup- Y port, shown as a iiat bar or plate c, set u pright and with its lower edge toothed; as at c', (see Fig. 2,) and attached at its ends to arms c2, fulcrumed at 0X on the loom side, a stop c3 under the inner end of one or both of the arms limiting the downward movement of the support c, so that normally the latter will be in the position shown in Figs. l and 2 and held stationary, the bunter sliding back-and forth thereover as the lay reciprocates. A feeler f, shown as ra fiat plate, preferably notched or toothed, as at its upper edge, as at f', Fig. 2, is attached to rocker-arms f2, fulcrumed at f3 on the outer ends of the rocking supports or arms c2. A link f4, pivotally connected with one of the feeler-arms at its upper` end, is loosely connected at its lower end with a lifter-arm f5, fulcrumed at f6 on a bracket securedl to the loom-frame, said lifter-arm being provided, preferably, with a roller f7 to travel on a cam O, mounted on a shaft O of the loom, which may be the usual cam-shaft, the double-throw cam O operating to lift the feeler twice for every revolution of the shaft OX, so that the upper edge thereof will approach very closely the bar c, and when the apparatus is running properly this vibrating movement of the feeler continues.

The leasing devices herein shown are the usual lease-rods L L, thejwarps being divided i thereby into groups, the warps in one group, as vw, Fig. 3, crossing the Warps w of the other group at the point wx between the leaserods in usual manner.

A series of detectors CZ are herein shown as pivotally mounted on a transverse shaft or rod dx, extended across the loom, the lower roo ends of the detectors being bent or olfset at d' toward the path of the feeler, but normally maintained out of engagement with the latter. The upper end of each detector is extended between the leasing members to engage a pair of crossed threads at the crossing wx thereof, as shown most clearlyin Fig. 3, it being shown therein that the detector crosses either warp at the side opposite to which said warp engages the other one of the pair. Manifestly the detectors will be maintained in the position shown and inoperative so long as the crossed warps of each bar remain intact, but should either warp fail then the detector will be free to slide along the other warp toward the back of the loom, the portion of each deteetor above its fulcrum being the heavier, such movement of the detector into operative position interposing its finger between the feeler and bunter-support c. After such interposition the feeler will at its next upward stroke engage the linger and press it against the toothed edge of the support c, so that at that time the feeler and the support will rock in unison on the fulcrum c to thereby raise the bunterb,so that at the next froward movement of the lay the bunter will engage the bent end a4 of the knock-off rod and move the latter in the direction of the arrow 10, Fig. 1, to release the shipper, and thereby stop the loom. Under normal conditions the feeler is vibrated about the fulcra f3 and-relatively to the bunter-support c, but the interposition of the detector-finger d will cause both the support and feeler to move in unison on the fulcrum cx.

The shipper and the usual belt-shifting mechanism, not herein shown, together with the knock-off devices and the bunter, constitute stopping means normallyinoperative and actuated by or through the abnormal positioning of a detector due to failure of one or both of its controlling-warps.

The notching or serrating of the opposed jaws c and f of the support and feeler, respectively, is to prevent twisting of the iinger portion of the detector when interposed therebetween.

My invention is not restricted to the precise construction or arrangement of parts as herein shown, as the same may be variously modified, but so far as I am aware it is broadly new in warp-stop-motion mechanism to maintain detectors in inoperative position by engagement with two crossed warps, the crossing being formed by some form of leasing device.

Having described my invention, what I claim, and desire to secure byLetters Patent, 1s-

1. In warp-stop-motion mechanism, leasing members, a series of detectors maintained inoperative by engagement with pairs of warps at their crossing-point between the leasing members, said detectors resting against the threads at the crossings thereof, and stopping means operated by or through abnormal positioning of a detector due to failure of one or both of its controlling-warps.

2. In warp-stop-motion mechanism, leasing members, a series of angularly-movable detectors maintained inoperative by engagement`with pairs of warps at their crossing between the leasing members, a fixed pivotal support for the detectors and stopping means, operated by or through abnormal positioning of a detector due to failure of one of its controlling-warps.

3. In warp-stop-motion mechanism, leasing members, a series of angularly-movable detectors having each an offset lower end and maintained inoperative by engagement with pairs of warps at their crossing between the leasing members, a normally-moving, coperatingfeeler, and stopping means actuatedby or through engagement of the feeler and the oset end of an abnormally-positioned detector due to failure of one of its controllingwarps.

4. In warp-stop-motion mechanism,parallel and separated leasing members to divide the warps into groups, a series of movable detectors each adapted to engage a warp in each group at the crossing-point of such warps between the leasing members and be maintained inoperative, and stoppin g means, actuated by or through a detector operativelypositioned by failure of one of its controlling-warps.

5. In warp-stop-motion mechanism, a series of detectors maintained inoperative by intact warps, each detector having an offset finger, a two -part feeler comprising a pivotallymounted member and a member normally movable relatively thereto, and stopping means, including a bunter controlled by the pivoted member of the feeler, movement of a detector into operative position interposing its finger between the members of the feeler, to effect their simultaneous movement, to thereby move the bunter into operative position.

6. In warp-stop-motion mechanism, a series of detectors maintained inoperative by intact warps, each detector having an offset finger, a cooperating vibrating member, stopping means including abunter, and a pivoted support therefor, to which the vibrating member is fulcrumed, movement of a detector into operative position interposin g its nger between the support and vibrating member, whereby movement of the latter operatively positions the bunter.

'7. In warp-stop-motion mechanism leasing members to divide the warps into groups, a series of detectors pivotally mounted below the warps and upturned to respectively engage and rest against a warp in each group at their crossing between the leasing members, a fixed fulcrum for said detectors, a vibrating feeler, and stopping means actuated by or through engagement of the feeler with the lower end of a detector operatively positioned by failure of one of its controllingwarps.

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8. In aloom, the lay, abunterpivotally connected therewith, stopping means `for the loom, including a link normally out of range of the bunter, a movable support for the bunter, a series of detectors maintained inoperative by intact Warps, each detector having an offset finger, and a vibrating feeler, movement of a detector into operative posi tion interposing its finger between the feeler and bunter-support, to thereby effect move ment of the bunter-support to operatively position the bunter.

9. In a loom, the lay, a normally-inoperative bunter pivotally connected therewith, stopping means, actuated by the bunter, a 

